Re: [OPSEC] OPSEC Digest, Vol 89, Issue 4
Ray Hunter <v6ops@globis.net> Sat, 16 May 2015 13:55 UTC
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Date: Sat, 16 May 2015 15:54:58 +0200
From: Ray Hunter <v6ops@globis.net>
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Subject: Re: [OPSEC] OPSEC Digest, Vol 89, Issue 4
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> Date:Tue, 12 May 2015 22:43:52 +0200 > From: Gert Doering<gert@space.net> > To: Jean-Michel Combes<jeanmichel.combes@gmail.com> > Cc:"opsec@ietf.org" <opsec@ietf.org>, Ivan Pepelnjak<ip@ipspace.net> > Subject: Re: [OPSEC] [Opsec] RFC7454: clarification about AS-Path > Filtering > Message-ID:<20150512204352.GP54385@Space.Net> > Content-Type: text/plain; charset="us-ascii" > > Hi, > > On Tue, May 12, 2015 at 07:47:18PM +0200, Jean-Michel Combes wrote: >> > The sentence "Network administrators SHOULD NOT advertise prefixes with a >> > nonempty AS path unless either they intend to provide transit for these >> > prefixes or they are originated these prefixes." would not be simply more >> > correct? > > Advertising your own prefixes is actually matched by filtering on the > path ^$ in Cisco regex speak - read: "the empty path". > > So, it is a slightly complicated way to formulate the thing, but it is > correct - a nonempty path means "transit for other ASes", and the empty > path is "yourself". On outbound. > > Your peer, on inbound, won't see an empty path of course. > > Gert Doering > -- NetMaster > -- have you enabled IPv6 on something today...? SpaceNet AG Vorstand: > Sebastian v. Bomhard Joseph-Dollinger-Bogen 14 Aufsichtsratsvors.: A. > Grundner-Culemann D-80807 Muenchen HRB: 136055 (AG Muenchen) Tel: +49 > (0)89/32356-444 USt-IdNr.: DE813185279 Unless you're intentionally performing AS prepending on prefixes you are originating. But I guess that exception should be obvious for most people who configure up BGP.
- Re: [OPSEC] OPSEC Digest, Vol 89, Issue 4 Ray Hunter